端面泵浦Zig-Zag板条激光介质的多角度放大研究
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摘要
激光介质的热效应对激光的光束质量有着严重的影响,板条激光介质可以利用Zig-Zag光路周期性穿越温度梯度方向以减小热聚焦及应力双折射效应。采用端面泵浦和传导冷却技术,板条激光器可以得到良好的光束质量和高平均输出功率,这些优点使其倍受关注,在工业和军事中有着重要应用前景。
论文在概述板条激光器的发展,重点介绍传导冷却端面泵浦板条(Conduction-Cooled End-Pumped Slab,CCEPS)激光器的发展及其进展情况的基础上,对基于CCEPS模块的多角度激光/放大器进行了研究。首先,运用几何光学的方法,对影响板条介质填充因子的各因素进行分析,讨论了各因素对填充因子的影响;建立了CCEPS的几何光学仿真模型,模拟了板条介质对入射光束角度的敏感性,分析了激光器中杂散光的形成原因。进一步研究了多程放大理论,计算了不同种子功率条件下,填充因子对输出功率的影响;论证了多角度放大的可行性,对其中存在的问题进行了讨论并确定了四程放大光路具体方案。开展了实验研究,实验了不同谐振腔型的CCEPS激光器,获得了最大功率142W的激光输出,光-光效率33%;实现了基于CCEPS多角度放大单程,双程以及四程放大光路,在小信号时得到十倍以上的放大输出;对实验提出了进一步改进方案。
The influence of thermal effect of the laser gain medium on the laser beam quality is serious. Slab laser gain medium eliminates thermal gradient induced lensing in the thickness direction and minimizes stress gradient induced birefringence when the ray propagates in a Zig-Zag manner. With End-Pumped and Conduction-Cooled technology,slab laser could produce high-average-power with good beam quality which makes it have developed rapidly and has a extensive application value in many fields.
By summarizing the development of slab laser,especially the development of Conduction-Cooled End-Pumped Slab (CCEPS)laser, geometrical optics analysis of CCEPS laser/amplifer and angularly multiplexed amplifer are studied. First, using geometrical optics method,we analyse the factors which affect the fill factor and discuss the influence of each factor;found the model of CCEPS and simulate the sensitivity of angle to the slab;analyse the cause of stray light .And then,study the theory of angularly multiplexed amplifer,compute the fill factor's influence on output power when the input power is different,discuss and confirm a four pass angularly multiplexed amplifer optical path.Last,we did some experiments based on CCEPS. The max output power of power oscillator is 142W with an optical to optical effiency of 33%.Experiment one pass,two pass and four pass master oscillator-power amplifier,realizing angularly multiplexed amplifer based on CCEPS which produce a decuple output power in small signal;Advance some suggestions for next step experiments.
论文在概述板条激光器的发展,重点介绍传导冷却端面泵浦板条(Conduction-Cooled End-Pumped Slab,CCEPS)激光器的发展及其进展情况的基础上,对基于CCEPS模块的多角度激光/放大器进行了研究。首先,运用几何光学的方法,对影响板条介质填充因子的各因素进行分析,讨论了各因素对填充因子的影响;建立了CCEPS的几何光学仿真模型,模拟了板条介质对入射光束角度的敏感性,分析了激光器中杂散光的形成原因。进一步研究了多程放大理论,计算了不同种子功率条件下,填充因子对输出功率的影响;论证了多角度放大的可行性,对其中存在的问题进行了讨论并确定了四程放大光路具体方案。开展了实验研究,实验了不同谐振腔型的CCEPS激光器,获得了最大功率142W的激光输出,光-光效率33%;实现了基于CCEPS多角度放大单程,双程以及四程放大光路,在小信号时得到十倍以上的放大输出;对实验提出了进一步改进方案。
The influence of thermal effect of the laser gain medium on the laser beam quality is serious. Slab laser gain medium eliminates thermal gradient induced lensing in the thickness direction and minimizes stress gradient induced birefringence when the ray propagates in a Zig-Zag manner. With End-Pumped and Conduction-Cooled technology,slab laser could produce high-average-power with good beam quality which makes it have developed rapidly and has a extensive application value in many fields.
By summarizing the development of slab laser,especially the development of Conduction-Cooled End-Pumped Slab (CCEPS)laser, geometrical optics analysis of CCEPS laser/amplifer and angularly multiplexed amplifer are studied. First, using geometrical optics method,we analyse the factors which affect the fill factor and discuss the influence of each factor;found the model of CCEPS and simulate the sensitivity of angle to the slab;analyse the cause of stray light .And then,study the theory of angularly multiplexed amplifer,compute the fill factor's influence on output power when the input power is different,discuss and confirm a four pass angularly multiplexed amplifer optical path.Last,we did some experiments based on CCEPS. The max output power of power oscillator is 142W with an optical to optical effiency of 33%.Experiment one pass,two pass and four pass master oscillator-power amplifier,realizing angularly multiplexed amplifer based on CCEPS which produce a decuple output power in small signal;Advance some suggestions for next step experiments.
引文
[1]R.Newman,Excitation of the Nd~(3+) fluorescence in Ca-WO_4 by recombination radiation in GaAs[J].J.Appl.Phys.,1963,34(2):437
[2]R.J.Keys,et al..Injection luminescent pumping of Ca F_2:U~3 with GaAs diode laser[J].Appl.Phys.Lett.,1964,4(3):50-52.
[3]M.Ross,YAG laser operation by semiconductor laser pumping[J].Proc.IEEE,1968,56
[4]吕百达,季小玲,固体激光技术发展前景展望[J].重庆师范学院学报(自然科学版),1999,16(4)
[5]6kJ laser fusion driver.IAFA Technical committee meeting on drivers for inertial confinement Fusion,Paris,1994
[6]Fan.T.Y,Welch.R..F,The special Issue on semiconductor Diode-pumped Solid-state Laser[J].IEEE J.Q.E.,1992,28(4)
[7]William.sterifer,et al..Special Issue papers:Advances in Diode Laser Pumps[J].IEEE J.Q.E.,1988,24(6)
[8]Plaessmann.H,Yamada K S,Rich.C.E,et al..Subnanosecond pulse gerneration from diode-pumped acousto-optically Q-switch solid-state lasers[J].Appl.Opt.,1993,32
[9]吕百达,张彬,高功率二极管泵浦固体激光器研究的进展[J].强激光与粒束,1994,6(2)
[10]L.Turi and T.Juhasz.,High-power longitudinally end-diode-pumped Nd:YLF regenerative amplifier[J].Opt.Lett,1995,20(2):154-156
[11]W.Schone,et al..Diode-Pumped CW Nd:YAG Laser with Output Powers up to 750W[J].OSA TOPS,1997,10:Advanced Solid State Laser
[12]D.Golla,S.Knoke,et al..300 W CW diode-laser side-pumped Nd:YAG rod laser[J].Opt.Lett,1995,20(10):1148-1150
[13]Gilles Feugnet,,Claude Bussac,et al..High-efficiency TEM_ Nd:YVO_4 laser Longitudinally pumped by a high power array[J].Opt.Lett,1995,20(2):157-159
[14]张申金,高功率激光二极管阵列侧面抽运Nd:YLF激光放大器[D].成都:四川大学,2004
[15]施亚玲,严淑敏等,二极管泵浦固体激光器的应用和发展[J].激光集锦,1999,9(3)
[16]克西奈尔.固体激光工程[M].北京:科学出版社,2002
[17]蓝信钜.激光技术[M].北京:科学出版社,2004
[18]张玲玲,孟俊清等,高功率板条激光器的研究进展激光与光电子进展2005,42(4)
[19]王志敏,徐剑秋,陈卫标,新一代大功率固体板条激光器的进展[J].激光与光电子学,2007,44(2)
[20]Hagop Injeyan,et al..End-Pumoed Zig-Zag slab gain medium,U.S.Patent 6,268,956(Jul,31,2001)
[21]Gregory D.Goodno,et al..High average Yb:YAG end-pumped Zig-Zag slab laser.Advanced Solid-State Lasers Conference,2001 Technical Digest
[22]吕百达,蔡邦维等.板条固体激光器研究的进展[J].激光与红外,20(3)
[23]Arun Kumar Sridharan,et al..Zig-Zag slab for solid-state laser amplifer:batch fabrication and parasitic oscillation suppression[J].Appl.Opt.,2006,45:3340-3351
[24]吕百达.固体激光器件[M].北京:北京邮电大学出版社
[25]张彬,吕百达,高功率多程激光放大系统逆问题研究[J].激光技术,2002,2
[26]A.Brignon,et al..Large-field-of view,high-gain,compact diode-pumped Nd:YAG amplifier[J].Opt.Lett.,1998,22(18):1421-1423
[27]Stephen Palese,Joseph Harkenrider,et al..High Brightness,End-Pumped,Conduction Cooled Nd:YAG Zig-Zag Slab Laser Architecture[J].OSA TOPS,2001,50,Advanced Solid-State Laser Christopher Marshall,ed
[28]William.W.Simmons,Light propagation through large laser systems[J].IEEE J.Q.E.,1981,17(9)
[29]L.M.Frantz and John S.Nodvik,Theory of pulse propagation in a Laser Amplifier[J].J.Appl.Phys.,1963,34(8).
[30]罗斌,激光二极管泵浦Nd:YA多程激光放大器研究[D].绵阳:中国工程物理研究院,2000
[31]M.Ross,YAG laser operation by semiconductor laser pumpproc.Proc.IEEE,1968
[32]J.M.Eggleston,L.M.Frantz,and H.Injeyan,Derivation of the Frantz-Nodvik equation for zig-zag optical paths,Slab Geometry Laser Amplifiers,IEEE J.Q.E.,1989,25(8)
[2]R.J.Keys,et al..Injection luminescent pumping of Ca F_2:U~3 with GaAs diode laser[J].Appl.Phys.Lett.,1964,4(3):50-52.
[3]M.Ross,YAG laser operation by semiconductor laser pumping[J].Proc.IEEE,1968,56
[4]吕百达,季小玲,固体激光技术发展前景展望[J].重庆师范学院学报(自然科学版),1999,16(4)
[5]6kJ laser fusion driver.IAFA Technical committee meeting on drivers for inertial confinement Fusion,Paris,1994
[6]Fan.T.Y,Welch.R..F,The special Issue on semiconductor Diode-pumped Solid-state Laser[J].IEEE J.Q.E.,1992,28(4)
[7]William.sterifer,et al..Special Issue papers:Advances in Diode Laser Pumps[J].IEEE J.Q.E.,1988,24(6)
[8]Plaessmann.H,Yamada K S,Rich.C.E,et al..Subnanosecond pulse gerneration from diode-pumped acousto-optically Q-switch solid-state lasers[J].Appl.Opt.,1993,32
[9]吕百达,张彬,高功率二极管泵浦固体激光器研究的进展[J].强激光与粒束,1994,6(2)
[10]L.Turi and T.Juhasz.,High-power longitudinally end-diode-pumped Nd:YLF regenerative amplifier[J].Opt.Lett,1995,20(2):154-156
[11]W.Schone,et al..Diode-Pumped CW Nd:YAG Laser with Output Powers up to 750W[J].OSA TOPS,1997,10:Advanced Solid State Laser
[12]D.Golla,S.Knoke,et al..300 W CW diode-laser side-pumped Nd:YAG rod laser[J].Opt.Lett,1995,20(10):1148-1150
[13]Gilles Feugnet,,Claude Bussac,et al..High-efficiency TEM_ Nd:YVO_4 laser Longitudinally pumped by a high power array[J].Opt.Lett,1995,20(2):157-159
[14]张申金,高功率激光二极管阵列侧面抽运Nd:YLF激光放大器[D].成都:四川大学,2004
[15]施亚玲,严淑敏等,二极管泵浦固体激光器的应用和发展[J].激光集锦,1999,9(3)
[16]克西奈尔.固体激光工程[M].北京:科学出版社,2002
[17]蓝信钜.激光技术[M].北京:科学出版社,2004
[18]张玲玲,孟俊清等,高功率板条激光器的研究进展激光与光电子进展2005,42(4)
[19]王志敏,徐剑秋,陈卫标,新一代大功率固体板条激光器的进展[J].激光与光电子学,2007,44(2)
[20]Hagop Injeyan,et al..End-Pumoed Zig-Zag slab gain medium,U.S.Patent 6,268,956(Jul,31,2001)
[21]Gregory D.Goodno,et al..High average Yb:YAG end-pumped Zig-Zag slab laser.Advanced Solid-State Lasers Conference,2001 Technical Digest
[22]吕百达,蔡邦维等.板条固体激光器研究的进展[J].激光与红外,20(3)
[23]Arun Kumar Sridharan,et al..Zig-Zag slab for solid-state laser amplifer:batch fabrication and parasitic oscillation suppression[J].Appl.Opt.,2006,45:3340-3351
[24]吕百达.固体激光器件[M].北京:北京邮电大学出版社
[25]张彬,吕百达,高功率多程激光放大系统逆问题研究[J].激光技术,2002,2
[26]A.Brignon,et al..Large-field-of view,high-gain,compact diode-pumped Nd:YAG amplifier[J].Opt.Lett.,1998,22(18):1421-1423
[27]Stephen Palese,Joseph Harkenrider,et al..High Brightness,End-Pumped,Conduction Cooled Nd:YAG Zig-Zag Slab Laser Architecture[J].OSA TOPS,2001,50,Advanced Solid-State Laser Christopher Marshall,ed
[28]William.W.Simmons,Light propagation through large laser systems[J].IEEE J.Q.E.,1981,17(9)
[29]L.M.Frantz and John S.Nodvik,Theory of pulse propagation in a Laser Amplifier[J].J.Appl.Phys.,1963,34(8).
[30]罗斌,激光二极管泵浦Nd:YA多程激光放大器研究[D].绵阳:中国工程物理研究院,2000
[31]M.Ross,YAG laser operation by semiconductor laser pumpproc.Proc.IEEE,1968
[32]J.M.Eggleston,L.M.Frantz,and H.Injeyan,Derivation of the Frantz-Nodvik equation for zig-zag optical paths,Slab Geometry Laser Amplifiers,IEEE J.Q.E.,1989,25(8)